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Документ A comprehensive approach to defect type recognition based on the results of dissolved gas analysis(ТОВ "Планета-Прінт", 2021) Shutenko, Oleg Volodymyrovych; Kulyk, Oleksii SerhiiovychДокумент Analysis of gas content in oil-filled equipment with defects for which ethane is the key gas(Харківський національний університет міського господарства імені О. М. Бекетова, 2020) Shutenko, Oleg Volodymyrovych; Kulyk, Oleksii SerhiiovychThe article presents results of a comprehensive analysis of the gas content in oil of 252 pieces of high-voltage equipment with defects, for which ethane is the key gas. There are 14 types of defects with maximum ethane content, which correspond both to overheating with temperature 150-300°C and low temperature overheating accompanied by discharges with different energy density (partial discharges, spark discharges, discharges with low and high energy density, arc discharges). The most typical defects are analysed and examples of their recognition by different researchers are given. For each type of defect, ranges of gas percentage values and gas ratio values are obtained. This is particularly important for the recognition of combined defects (overheating that is accompanied by discharges), because for such defects the values of these criteria are not regulated in any known standard for the interpretation of the results of the analysis of gases dissolved in oil. For the first time, 14 nomograms and graphic areas of defects for which ethane is the key gas have been obtained, which makes it possible to significantly expand the range of reference nomograms, as the regulatory document in force in Ukraine does not contain reference nomograms for defects with the maximum content of ethane. For all 252 pieces of equipment, a comparative analysis of known diagnoses with diagnoses made using the Duval triangle was made. It has been determined that diagnoses made using different methods may differ significantly from each other as well as from real diagnoses. The ranges of gas percentage and gas ratio values obtained in the work, together with the defect nomograms, make it possible to use three of these criteria simultaneously to recognise the type of defect with a maximum ethane content, which in turn will improve the reliability of defect type recognition based on the analysis of gases dissolved in oil.Документ Assessment of the oxidation degree of transformer oils based on multiple non-linear regression models(Національний технічний університет "Харківський політехнічний інститут", 2022) Shutenko, Oleg VolodymyrovychДокумент Early detection of defects developing in oil-filled equipment based on the results of dissolved gas analysis(Національний технічний університет "Харківський політехнічний інститут", 2023) Shutenko, Oleg VolodymyrovychДокумент A method of early detection of defects in high-voltage oil-filled equipment based on analysis of the dynamics of criteria used to interpret the DGA results(ТОВ "Друкарня Мадрид", 2020) Shutenko, Oleg VolodymyrovychДокумент Modeling the electric field strength distribution of overhead lines, considering the wire sag(ТОВ "Планета-Прінт", 2021) Shutenko, Oleg VolodymyrovychДокумент Recognition of discharges that are accomanied by lowtemperature overheating based on the analysis of gases disissolved in the oil of high-voltage transformers(Національний технічний університет "Харківський політехнічний інститут", 2021) Shutenko, Oleg Volodymyrovych; Kulyk, Oleksii SerhiiovychBased on the analysis of test results for 135 high-voltage transformers, ranges of gas percentage, gas ratio values were obtained and nomograms for 10 types of combined defects were made, representing discharges with different intensity which are accompanied by overheating with temperature of 150-300°C. It has been established that in transformers with discharges accompanied by low-temperature overheating the values of CH4/H2, C2H2/CH4, C2H2/C2H6 and C2H2/C2H4 ratios determine the discharge energy, in accordance with the norms regulated by the most known standards, the C2H4/C2H6 ratio varies slightly depending on the hot spot temperature and the C2H6/CH4>1 ratio value. Dynamics of defects nomograms changing in the process of their development is analyzed. It is stated by the analysis results that in majority of cases the primary defect is discharges with different intensity, which are accompanied by low-temperature overheating. Overheating occurs in the process of discharge development. The analysis of recognition reliability of discharges with different intensity which are accompanied by 150-300°C overheating was made, using norms and criteria regulated by the most known standards and methods. The results of the analysis show that the most reliable recognition of the defects analyzed is provided to a large extent by the graphical methods, namely the ETRA square and the Duval triangle. The results obtained will significantly increase the recognition reliability of combined defects based on the results of the dissolved gas analysis in the oil.